Grate.



w. C, ARMSTRONG;

GRATE.

APPLicMmN mm marmo. 1914.

a z'sHEETs-suzfr l.

patented Abr. 11,1916. l

w., c. ARMSTRONG.

I GRATE.

APPLICATION FILED 056.10. |914.

1,178,698.. Patented Apr. 11, 1916.

2 SHEETS-SHEET 2.

Egg,

mwwtoz same into the fuel and each of the hollow grate bars 1 is provided with a series of openings 10 for this same purpose. In the present instance these openings extend through the lateral edges of the top walls .movable and have their lateral edges beveled` to enable. the plate'or top wall to seat upon the .beveled upper edgesI of the side walls the grate In the present instance the openings drair ports'are provided by forming notches in the beveled edges of the top plates. The bevels do not .extend to the top surface of the plate and, cons equently, the ports may be formed therein entirely beneath the top surface of the grate. Ily arranging the outlet ports 1'0 slightly below the surface olf the grate the liability of cinders or ashes entering theopenings is materially reduced without in any way reducing the eliiciency of the blast, and 'by forming the ports in the removable top Yplate of the grate bar it ispossible by changing. lthese plates to provide'the grate bars `with openings or ports of diderent sizes to accommodate the same' to different kinds of fuel or for other purposes. The air blast may be delivered to the hollow frame member 6 from any suitable source. In' the present instance an air blast pipe 11 of suitable proportions extends lengthwise of the frame member beneath the same and preferably beneath' the ioor of the ash-pit and isconvnected with the bottoni wall'of' the frame member by a series of connecting pipes 12. The connection between the pipe 12 and the frame member -is l preferably formed by means of a sliding collar 13 mounted about the pipe 12 and adapted to' be drawn upward and to clamp a packing let against an annular surface 15 surrounding the inlet opening for the frame memberfthereby providing a joint which is very quickly made and which `will be tight.

In order that the grate bars may be removed and reassembled without diiiiculty I have elongated the trunnion 3 at the outer ends of the grate bars and have spaced the outer ends oil th'e grate bars away from their To retain thev taining block in the form of a U-shapcd collar 16 which fits between the end of the bearing in the supporting frame 5 and the adjacent end of the grate bar, thus 4eiiectually preventing the removalof the grate barwhile the retaining block is in position. In the construction .here shown I have formed these retaining blocks in `integral groups, thus preventing any turning of the individual blocks which might cause themto be displaced. In the present instance I have provided above the side and end frame members, 5 and 25, a tubular'box-like member 18 which is hollow and is provided with air ports 19, whereby a blast of air can be caused to circulate through the same and' into the, space above the grate. This device constitutes a protector for -the brick walls-l the inner wall of the hollow protector is in chned so as to cause the ashes or cinders which may come in contact therewith to gravitate onto the' grate bars, it being noted that the lower edge of this inner wall projects over tlieretaining block 1G `and is close to the ends of the several grate bars. This hollow protector preferablyv is formed of separately removable 'sections and extends on three sides of the grate, although, of course, the spacing blocks are provided only at the ends of the grate bars.

It will be noted that the frame members' rocked. By the construction -herein shown all the grate bars are movable and inasmuch as the inclined wall of the protector 18 prevents the accumulation of ashes or cinders upon any' fixed part at the edges-o f the grate it will be apparent that the'rocking of the grateswill effectually remove all the ashes and cinders. Preferably, the lower edge of the inner wall of the rear protector` extends forward overl the rear edge-of the rear? grate bar and to permit the movement of the grate bar and at the same time to Y keep the space at/the rear edge thereof closed so that cinders will not accumulate between the grate barv and the fixed wall, either when the grate bar is'in its normal position or is in its dumping position, I have provided the inner edge of the protector with a curved recess 26 within" which Hts a projection 27 extending longitudinally of the grate bar and arranged at the rear edge hdmi@ andf' de'scribed. one -fingntion if Willi be um y'has beoii chosen -foz .the Ilyiarid that f1 do'4 l "inner corner ofsfaid protectory and loW/fgratolbars. 'Further;

edge; of said' grate bau having a *mbelating ces'sto close th spaco-,betweeusaid gija't ahdSa-id protector. rv5,"l`n a gx/ato, a hoilowffram'e memb Commu'nio'atingwith a vrsom' e` ofi. Suppl ppulrt by sid hollow frame member/and .commun ber-y andj'commnicatingf with th thereof, Said hollow prototo'rha iig ari inn upwardly therefrom and communicating In testimony whereof, I ax my signature with 'a source of mr supply, lsind protector 1n presence of two wltnesses.

haring its inner lower corner projecting'in- XVILLI LM C ARMSTROG wardiy to a poiirinear said grate bars and L having its i11'n'e'r""f1ce provided with 0pen Witnesses:

ings whereby il'ima'y be supplied above the F. XV. SCHAEFER,

grate. 7 H. L. HAMMAKER.

4, j v 1,178,698 O i 

